The set of all the x-coordinate is called The Range.
* * * * *
Though more often, the x-coordinates are called the DOMAIN (and the y-coordinates are the RANGE).
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The range
It is the codomain, often called the range.
It is known as the domain.
This is most often called the "range" of the relation. * * * * * Though more often the first coordinate is the DOMAIN and the second coordinate is the RANGE.
Range